[That's very vague, but in terms of what it could be referring to...it explains some things. If he cut himself off, it would certainly explain why he'd been acting so strangely, and hadn't grouped himself with the rest of the rescue party.

It does leave at least one thing unanswered, though, and Shun observes Fubuki closely, as if searching for reactions.]

And I started feeling your guilt not long after I was taken. So either you didn't completely cut yourself off, or the thing you're guilty about wasn't that.